Hassaan was also a tribal leader of Hassassins (Highly trained assassins in ancient times in the era of Fatimid Empire of Persia and Seyria who use sordid means of medications and trances to train their assassins; in short they were ruthless killers or highly skilled mindless murderers)

Hassaan-i-sabbah was a Man of high intellect, therefore he introduced a new form of torture...he believed that physical pain is temporary so he use to bereft one from his fortitude and inflict irreversible damage to ones mind n soul.

From the legend Hassaan is also believed to be a person who is very dangerous and merciless.

like its said 'Different people, different mentality.'
So You cannot define Hassaan Ahmed, I just gave some facts :)

Hassaan Ahmed, you question too much. You and your skepticism annoy me.
'Have you ever seen the new guy 'Hassaan Ahmed' in our school? he's creepy but so hot!' said Saira